Usui, Keisuke
Sasai, Keisuke
Ogawa, Koichi
Article History
Received: 7 August 2017
Revised: 6 March 2018
Accepted: 8 March 2018
First Online: 14 March 2018
Compliance with ethical standards
:
: The authors declare that they have no affiliations with or involvement in any organization or entity with any financial interest in the subject matter or materials discussed in this manuscript.
: All procedures involving human participants were performed in accordance with the ethics committee of the authors’ institution, and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. This study did not involve animals.
: Informed consent was obtained from all participants included in this study.